<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
      <style type="text/css">
          *{margin:0;padding:0;}
           .layer1{width:100%; height:100px;  background:blue;color:white;text-align:center;}
		            .layer1-1{width:50%; height:100px; background:#300; color:#0F0; text-align:center; float:left}
                    .layer1-2{width:50%; height:100px; background:#FF0; color:#609; text-align:center ;float:left}
					.layer1-3{clear:both;}   
           .layer2{width:100%; height:400px; background:yellow;color:blue;text-align:center;text-align:center}
		            .layer2-1{width:100%; height:200px; background:#0F0; color:#0F0; text-align:center}
					          .layer2-1-1{width:30%; height:200px; background:#303; color:#0F0; text-align:center;float:left}
                              .layer2-1-2{width:40%; height:200px; background:#999; color:#609; text-align:center;float:left}
							  .layer2-1-3{width:30%; height:200px; background:#0FF; color:#0F0; text-align:center;float:left}
							  .layer2-1-4{clear:both;} 
                    .layer2-2{width:100%; height:200px; background:#C6C; color:#609; text-align:center}
					          .layer2-2-1{width:100%; height:100px; background:#0F6; color:#0F0; text-align:center}
                              .layer2-2-2{width:100%; height:100px; background:#C6C; color:#609; text-align:center}
							  
           .layer3{width:100%; height:130px;  background:green;color:white;text-align:center;}           
               
		  
       </style>
    </head>
    <body>
       <div class="layer1">
                <div class="layer1-1"></div> 
                <div class="layer1-2"></div> 
                <div class="layer1-3"></div>        </div>
       <div class="layer2">
                <div class="layer2-1">
                     <div class="layer2-1-1"></div> 
                     <div class="layer2-1-2"></div>
                     <div class="layer2-1-3"></div> 
                     <div class="layer2-1-4"></div>
                </div> 
                <div class="layer2-2">
                    <div class="layer2-2-1"></div> 
                    <div class="layer2-2-2"></div>
                </div>    
       </div>
       <div class="layer3">底</div>


<body>
</body>
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